{
  "pools": {
    "wildcard-new": {
      "servers": [ "localhost:12345" ]
    },
    "wildcard-old": {
      "servers": [ "localhost:12346" ]
    }
  },
  "route": {
    "type": "MigrateRoute",
    "from": "PoolRoute|wildcard-old",
    "to": "PoolRoute|wildcard-new",
    "start_time": START_TIME,
    "interval": 4
  }
}
